• Corpus ID: 239050087

Nudging-based data assimilation of the turbulent flow around a square cylinder

@inproceedings{Zauner2021NudgingbasedDA,
  title={Nudging-based data assimilation of the turbulent flow around a square cylinder},
  author={Markus Zauner and Vincent Mons and Olivier Marquet and Benjamin Leclaire},
  year={2021}
}
We investigate the prediction of the turbulent flow around a canonical square cylinder at Re = 22000 solving the unsteady Reynolds-averaged Navier-Stokes (URANS) equations. The limitations of URANS modelling are overcome through the application of a data assimilation technique involving a feedback control term, allowing to drive the URANS predictions towards reference data. Using regularly-spaced temporally-resolved reference data that are extracted from DNS, we assess the abilities of the data… 

References

SHOWING 1-10 OF 45 REFERENCES
Scrutinizing URANS in Shedding Flows: The Case of Cylinder in Cross-Flow in the Subcritical Regime
To unravel the widespread perception that the RANS (Reynolds-averaged Navier-Stokes) concept is unreliable in predicting the dynamics of separated flows, we assessed the performance of two RANS
Reconstruction of unsteady viscous flows using data assimilation schemes
TLDR
This paper investigates the use of various data assimilation (DA) approaches for the reconstruction of the unsteady flow past a cylinder in the presence of incident coherent gusts and shows how an iterative procedure can be used within the framework of ensemble-based methods to deal with both non-uniform unsteadY boundary conditions and initial field reconstruction.
Turbulent flow around a square cylinder at Reynolds number 22,000: A DNS study
Abstract The turbulent flow around a square cylinder at Reynolds number 22 , 000 (based on the cylinder diameter and the inflow velocity) is studied by means of direct numerical simulation. An
Synchronization to Big Data: Nudging the Navier-Stokes Equations for Data Assimilation of Turbulent Flows
TLDR
This study fixes the standard requirements for future applications of nudging to complex turbulent flows and shows that for more complex flow configurations, like the case of anisotropic rotating turbulence, the presence of cyclonic and anticyclonic structures leads to unexpectedly better performances of the algorithm.
State observer data assimilation for RANS with time-averaged 3D-PIV data
State observer techniques are investigated for the assimilation of three-dimensional velocity measurements into computational fluid dynamics simulations based on Reynolds-averaged Navier–Stokes
Reynolds averaged simulation of unsteady separated flow
The accuracy of Reynolds averaged Navier–Stokes (RANS) turbulence models in predicting complex flows with separation is examined. The unsteady flow around square cylinder and over a wall-mounted cube
A laser-Doppler velocimetry study of ensemble-averaged characteristics of the turbulent near wake of a square cylinder
Ensemble-averaged statistics at constant phase of the turbulent near-wake flow (Reynolds number ≈ 21400 around a square cylinder have been obtained from two-component laser-Doppler measurements.
Small-scale reconstruction in three-dimensional Kolmogorov flows using four-dimensional variational data assimilation
Significant insights in computational fluid dynamics have been obtained in recent years by adopting the data assimilation methods developed in the meteorology community. We apply the four-dimensional
Simulation of vortex shedding past a square cylinder with different turbulence models
SUMMARY This paper presents the results of numerical simulations of vortex shedding past a free-standing square cylinder at ReD22000, obtained with different turbulence models. Using wall functions,
State observer-based data assimilation: a PID control-inspired observer in the pressure equation
A novel state observer-based data-assimilation technique is described and then assessed with a numerical test case. This novel technique assimilates pressure data through a state observer that is
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